Int 21 Fn 5B  - DOS 3+ - Create New File                                   [D]

   AH = 5Bh
   CX = file attribute (see AX=4301h)
   DS:DX -> ASCIZ filename

Return: CF clear if successful
       AX = file handle opened for read/write in compatibility mode
   CF set on error
       AX = error code (03h,04h,05h,50h) (see AH=59h)

Notes: unlike AH=3Ch, this function will fail if the specified file exists
     rather than truncating it; this permits its use in creating semaphore
     files because it is an atomic "test and set" operation
   under the FlashTek X-32 DOS extender, the filename pointer is in DS:EDX

See Also: AH=3Ch,AH=5Ah